JPS61262452A - Roll device for producing thin metallic sheet by continuous casting - Google Patents

Abstract

PURPOSE:To cool rationally a roll surface and to prevent the generation of a heat crown by forming the internal constitution of the roll into a shrinkage-fit double construction consisting of a sleeve and arbor and providing hollow grooves between the sleeve and arbor along the peripheral surface as cooling water flow passages by segmenting the same from the hollow grooves adjacent to the arbor surface. CONSTITUTION:The inside constitution of the roll is made into the shrinkage-fit double construction consisting of the sleeve 1 and the arbor 2. The cooling water flow passages 9 are provided between both. The passages 9 are connected to water feed passages 13 by water feed passages 19 provided vertically to the arbor 2. The passages 13 are connected by water feed pipings 6 to a water feed main pipe 5. A rotational driving shaft 4 is disposed in the central part of the roll and is supported by bearings provided at both ends of the shaft and partition wall parts 21, 22 provided in the main pipe 5. The cooling water is thereupon passed in the cooling water flow passages 9 of the roll under rotation at the required speed and while the surface temp. of the sleeve 1 is maintained at the required temp., a metallic sheet is produced on the roll surface.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is for manufacturing a thin metal sheet by solidifying a molten metal (hereinafter referred to as molten metal) by continuous casting using a rotating roll as a mold. The present invention relates to a roll device that prevents various defects caused by an increase in temperature of the surface of the rotating roll used for.

[Conventional technology]

Conventional technology for manufacturing thin metal sheets in continuous casting using rapidly rotating rolls as molds or cooling bodies uses a single roll or counter-rotating twin rolls. Depending on the situation, cooling gas or water may be injected into the solidified material through a nozzle to further speed up the cooling. Applying auxiliary means instead of cooling only the roll surface is because when the temperature rise becomes high, the roll surface may suffer from deformation due to thermal strain and wave formation due to uneven temperature distribution. . Such deformation, waves, and other defects that occur on the roll surface cannot be ignored because they have a non-negligible effect on the dimensions of the manufactured board, especially the shape in the width direction. As the rotating roll, a single roll and a counter-rotating twin roll are usually used.

For example, in the case of a single roll, "warping" occurs in the width direction, and in the case of twin rolls, for example, deformation occurs on the surfaces of both rolls, resulting in a sheet thickness distribution of "1 concave shape" in the width direction. This is because the surface portion of the roll surface that comes into contact with the molten metal rises in temperature more than other portions.

In the case of conventional technology that uses a single roll or twin rolls, methods are used to cool the surface of the roll by cooling the inside of the roll with water, etc., and to cool the surface of the roll by spraying gas or water. However, materials with high thermal conductivity, such as those made of copper-based metal alloys, are also used as materials for the roll itself, materials with high strength, such as those made of iron, and materials with high heat resistance, such as Made of heat-resistant alloy steel. However, there are also preventive measures to prevent dimensional problems, such as partially changing the roll thickness by overestimating the dimensional thermal expansion difference or thermal conduction difference caused by the temperature difference between the surface area where the molten metal comes in contact with other areas. However, even with elaborate efforts, it was difficult to eliminate this drawback. Therefore, it is possible to shorten the contact time between the roll surface and the molten metal as the next best option, even if it is not perfect.
As an auxiliary measure, measures such as roll deformation to maintain the shape and dimensions in the width direction appropriately have been considered, but there is no definitive solution.

[Problems with the conventional technology and problems to be solved] It is an object of the present invention to eliminate the various drawbacks caused by the conventional technology described above, particularly the deformation of the shape and dimensions of the product metal plate in the width direction. To achieve this objective, the roll has been improved to provide a better cooling method with a configuration for maintaining proper sail surface geometry with uniform temperature distribution.

[Configuration as means for solving the problem] The present invention has the following features:
The internal structure of the roll is made up of a sleeve 1 and an arbor 2, which are shrink-fitted to form a double structure, and a groove adjacent to the arbor surface is separated between the sleeve 1 and the arbor 2, and the groove is cooled along the circumferential surface. Attach it as a water flow path. The cooling water is
A piping device provided at one end of the shaft is used to supply water to a main water supply pipe provided around the drive shaft in the center of the rotating roll, surrounding the shaft, and from the main water supply pipe 5 to a water supply chamber provided inside the arbor. 17, and the water supply chamber has a volume sufficient to supply water to the water supply channel 19 provided inside the arbor 2 having the required number of concave cooling gaps 9. The water supply chamber 17 and the main water supply pipe are connected by a water supply pipe that surrounds the outer periphery of the support shaft of the roll provided radially from the center of the roll, or by an independent water pipe that is not related to the support shaft. It is connected to the main pipe 5. The drainage system has the same structure as the water supply system, and water passes through the cooling groove 9, passes through a drainage channel provided in the arbor 2 and corresponds to the water supply channel, and is collected in a drainage chamber corresponding to the water supply chamber 17. A drainage pipe and a main drainage pipe corresponding to the water supply pipe and main water supply pipe are provided, and water is drained by a piping device provided at the other end of the rotating shaft 4. The main water supply and drainage pipes are
In addition to a structure in which the drive shaft is divided into at least two parts around the drive shaft, it is also possible to provide a double pipe around the drive shaft. Provide thermal insulation between the shaft and the tube.

In order to make the temperature distribution in the width direction of the sleeve 1 uniform and the cooling of the mouth surface uniform, the width of the sleeve cooling surface is made close to the roll width, the roll width is the same width as the plate to be cooled, and the line width is Cool down quickly. In order to free thermal expansion and water sealing at both ends of the sleeve and roll, rubber gaskets 28 and 29 (FIG. 3A) made of heat-resistant elastic material are used to seal the gap in the width direction and circumferential direction. The roll surface is maintained at a uniform temperature by changing the shape and dimensions of the groove, the flow rate, or the amount of water.

〔Example〕

Embodiment 1 An embodiment of the present invention will be described based on the drawings. FIG. 1 is a partially enlarged partially sectional perspective view of a roll according to an embodiment of the present invention, and FIG. 2 is a partially enlarged front sectional explanatory view of a roll that is very similar to, but not identical to, FIG. 1. The cooling gap 9 is provided in a spiral shape in the umber 2, and the outer surface is provided with the sleeve 1.
Glue and support the inner surface. FIG. 3 shows a partially enlarged cross-sectional side view of the upper half of the roll of another applied example. Although the rolls shown in Figures 1, 2, and 3 are not the same, the technical concept should be considered the same, so the same numbers are used for each part that has the same function and effect and produces the same effect. .

The molten metal shown in FIG. 1 is solidified on the surface and a pressing force is applied to produce a metal plate. This roll has an arbor 2 inside, and the roll surface plate C (hereinafter referred to as sleeve) 1 and arbor 2.
Between the outer surfaces, there is a gap 9 between which cooling water is filled and circulated (hereinafter referred to as a cooling gap).
It is connected to the water supply chamber 13 by a vertically provided water supply channel 19, and the water supply chamber 13 is connected to the main water supply pipe 5 by a water supply pipe 6. A rotary drive shaft 4 is disposed in the center of the roll, and is supported by bearings (not shown) provided at both ends of the shaft and nine partition parts 21 and 22 (FIG. 3A) provided within the main pipe 5. A main water supply pipe 5 is provided so as to surround the outer periphery of the rotating shaft 4 at a required interval. The flow path 6 and the arm 7 (FIGS. 1 and 2), which serve as the water supply pipe and the support arm, are as follows:
They are arranged radially from the main pipe 5 in the center, one end is fixed to the main pipe 5, the other end is fixed to the bottom surface 17 of the arbor 2, and the part where the arbor 2, the rotary roll surface plate 1, and the cooling water flow path are provided. To support.

Although the water supply has been described, the case of drainage is illustrated in FIG. 3A, and is the same as the water supply. Roll surface plate 1 (hereinafter referred to as
The constituent materials used for the sleeve (also called sleeve) and arbor 2 are arbitrarily selected depending on the application from among materials with high strength, high durability, corrosion resistance, high temperature resistance, low thermal expansion, and high thermal conductivity. Use at least one or more.

For example, common steel, structural steel, alloy steel, stainless steel, copper, aluminum, and others may be used alone or in combination. For example, we have used stainless steel on the front side and copper cladding or lining on the back side. I have also tried using just stainless steel or just copper alone. Since copper has high strength, good thermal conductivity, water resistance, and moderate thermal expansion, we investigated the results of utilizing these properties. Stainless steel is promising because of its high strength, good corrosion resistance, high temperature resistance, standard thermal expansion, and relatively easy processing. In particular, the thickness of the plate is
Although thinner materials have lower strength, they improve the cooling effect of cooling water compared to thicker materials. When water is used for cooling, corrosion resistance is important and the roll surface requires high temperature resistance. , each can be used independently, but
For example, it has been effective to use a stainless steel plate on the surface of the roll and clad copper on the back of the roll plate, which uses cooling water. However, in many cases, it is appropriate to select a case, pie, or case depending on the conditions of use and the purpose of the manufactured board.

Example 2 The structure of the sleeve, cooling part and support part on the roll surface is extremely important in the present invention. Here, we would like to examine the basic elements based on the trial results of one embodiment.

In order to improve adhesion at the contact area between the roll sleeve l and the arbor 2, a double structure is provided with a phosphorus source. As shown in FIG. 3A, in order to maintain the sleeve 1 and the phosphorus source, the side wall plate 16 is applied and fixed with screws, and the sealing groove is set in the line groove as shown in the figure. It is fitted with an O-ring or ring 28 made of a good elastic material and sealed sufficiently.

In the perspective view of FIG. 1, support shafts 6 and 7 fixed to the bottom part 17 of the arbor 2 are provided radially from the main pipe 5 which surrounds the rotary drive shaft 4 and the mosquito shaft 4 in the center of the roll, and the support shafts 6 and 7 are fixed to the bottom part 17 of the arbor 2. The support shaft 6 provided with a water flow path is divided into a water supply flow path and a drainage flow path. In the one shown in FIG. 2, the support member 7 only provides support, and the cooling water passages are arranged inside the support member 7 separately from the nine ones 6.

The relationship between the sleeve 1, the arbor 2, and the water flow path shown in FIG. 1 is developed in cross section, and the end portion is shown in FIG. 3A and the explanatory view of the drainage flow path is shown in FIG. 3B.

FIG. 3A is a partially enlarged cross-sectional view of the portion from directly below to above the rotating shaft 4. FIG. Cooling water is advanced in the direction of the arrow from the main water supply pipe 6, passes through the outer circumference of the rotating shaft 4, flows through a channel 18 inside the arm 6, which serves as both a support arm and a water supply pipe, and enters a water supply chamber surrounded by a bottom wall 17. Store water at 17A. The stored water flows through the water supply channel 19 of the arbor 2, enters the cooling gap 9, and is sufficiently replenished. It is suitable for these cooling water systems to carry out the present invention and provide a device to consider and rationally control the temperature of the cooling water to be supplied and the temperature of the discharged water, and to supply and drain the water. I won't touch on it here.

I would like to describe the illustrated embodiment and illustrate the problem.

The main water supply pipe 5 that forms the water supply channel 8 that surrounds the rotary shaft 4 at a required interval is provided with an internal partition ring 21 as shown in the figure, and the line ring is provided with cooling water channel holes depending on the application, so that it can pass through. It is also possible to control and use the two extremes of allowing or blocking the passage at all, as well as the intermediate range between them. The drainage system is also shut off by providing a ring 22 that partitions the inside of the pipe. Shutoff rings 21 and 2
2 is also provided as a bearing for the rotating shaft 4. Water is supplied with water pressure to the flow path 8 in the main pipe 5, and from the flow path 1B to the water supply chamber 1.
7A, flows through the channel 19, flows into the cooling gap 9, contacts the sleeve 1, and has a cooling effect.

The water used for cooling and heated is drained from the other end of the rotating shaft 4. The method of connecting the water supply system and drainage system is through cooling gap 9.
There is a method of providing a lateral groove (not shown) that connects with the drain gap 9B. As shown in Fig. 3B, it flows into the drainage gap 9B connected by a communication groove (not shown), enters the drainage chamber through the flow path 19]3, enters the drainage channel 8BK of the main pipe 5 through the drainage channel 18B, and enters the shaft. Another method for draining the water is to drain it by using a drain device at the end (not shown). Another method is to control the water supply chamber 13 and the drain chamber 13B by passing them through the partition ring 23t. The ring 23 is completely shut off or an inflow hole is provided to allow the water to flow into the drain chamber 13B through the cooling gap 9t without significantly lowering the water pressure in the water supply chamber. Drainage can be performed by controlling the water pressure in the flow path 8B in the main drainage pipe.

Sleeve 1 is continuously heated over time and its surface temperature rises even though it is cooled by cooling water from inside, so the most important issue for manufacturing solidified plates is to achieve ``uniform plate thickness in the width direction.'' Difficulties arise at certain points. As one of the countermeasures, the sleeve 1 of the roll should not be made in one piece, but on the side.
There is a method of dividing the roll into multiple pieces vertically, horizontally, or vertically and assembling them to make a single roll. Although this method could be applied to the container, no significant effect was observed compared to the one-piece container. At this time, the sleeve can also be divided by dividing the arbor 2 into multiple blocks perpendicular to the rotating shaft 4 and assembling the blocks to form a single sleeve. It is assumed that it can be used as a comprehensive product. for example,
It is possible to change the shape and dimensions of the cooling gap 3 provided in the arbor 2, or to communicate the cooling water flow path with an adjacent block as required, or to differentiate between the parts of the sleeve 1 where the temperature rises the most in the width direction and the parts where it does not. The cooling water supply and drainage can be carried out separately, and the cooling effect can also be improved. The results of a series of tests were confirmed to be valid. At the same time, it has become clear that it is important to eliminate the occurrence of non-uniform temperatures during heating during solidification of the molten metal on the roll surface. As a countermeasure, we confirmed that it is effective to make the width of the sleeve close to the width of the cooling gap and to make both ends free. It was also confirmed that the cooling width of the sleeve should be equal to the width of the sleeve by allowing the flow to flow through the arbor cooling gap. An effective method was to seal the free ends of the sleeve and arbor by using the required number of heat-resistant elastic ring gaskets 28 and 29 shown in FIG. 3A, although only two are shown.

In the case of high temperatures, suitable metal packings could be used in combination with the elastic packings 28 and 29, and were effective.

The sleeve and arbor are used as a phosphorus source, but at the free end, the gap between the presser plate at both ends and the end of the sleeve is slightly larger than the so-called expansion allowance, which is calculated based on empirical values in addition to calculated values, and is determined by the increase in temperature of the sleeve. Make it capable of absorbing thermal expansion sufficiently.

〔effect〕

According to the present invention, it is possible to rationally cool the roll surface for manufacturing thin metal sheets by continuous casting.

- It is possible to prevent the occurrence of heat crown. Increases roll durability. A low-cost device can be manufactured and applied. As a result, the thickness of the manufactured plate in the width direction is made uniform, and the manufacturing cost is reduced.

[Brief explanation of the drawing]

Fig. 1 is a partially enlarged partially sectional perspective view of a roll according to an embodiment of the present invention, Fig. 2 is a partially enlarged front sectional explanatory view of the roll, and Fig. 3 is a partially enlarged sectional side view of the upper half of the roll. In the figure, figure A shows the end part and figure B shows the drainage part. 1...Screen IJ-F, roll surface plate 2...Arbor 3...Arbor body 4...
・Rotating shaft, drive shaft 5...Main water supply pipe 6...Arm (installed inside the cooling channel) 7...Arm (support) 8...Main flow channel 9...
・Cooling space @ 17A... Water supply chamber 17... Bottom wall 19... Water supply channel 18... Channel

Claims (1)

[Scope of Claims] 1. When a continuous molten metal is solidified on the sleeve surface of the roll to produce a thin plate having a uniform width and a required thickness using a roll device, the roll fits into the sleeve and the inner surface of the sleeve. The arbor is made of a closely integrated arbor, and the circumferential surface of the arbor is provided with a flat surface that is in close contact with the inner surface of the sleeve and supports the sleeve, and a groove that allows water to flow through to cool the sleeve from the inner surface, and the water flow groove. It consists of a flow path for water supply and drainage, and a central shaft that supports the arbor with a plurality of arms and drives and rotates, and maintains the required temperature by passing cooling water through the arbor groove that supports the sleeve on the surface of the sleeve of the roll that is rotated at the required speed. A roll device for manufacturing thin metal plates by continuous casting, characterized by manufacturing metal plates on the surface of the roll. 2. The roll device for producing thin metal plates by continuous casting according to claim 1, wherein the roll cooling width is at least the same as or greater than the width of the metal plate to be produced. 3. Thin metal produced by continuous casting according to claim 1, which has separate water supply channels and drainage channels in which arbor cooling water grooves are provided along the circumference and cool the water in the width direction depending on the temperature of the sleeve. Roll equipment for sheet manufacturing. 4. The roll device for manufacturing thin metal sheets by continuous casting according to claim 1, wherein the arbor width end that is closely fitted with the sleeve width end is a free end and a required gap is provided. 5. The gaps formed by the sleeve and the arbor correspond to the thermal expansion in the transverse direction and the thermal expansion in the diametrical direction, and each of these gaps is fitted with at least one ring packing. 5. The roll device for producing thin metal plates by continuous casting according to item 4. 6. The roll device for manufacturing thin metal sheets by continuous casting according to claim 1, wherein the arbor is laterally divided into a plurality of blocks in a direction perpendicular to the driving rotation axis and used by assembling the blocks.